Java中使用Gson操作json数据

引入依赖

     <dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.9.0</version></dependency>

Gson工具类

package cn.test.util;import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;/*** Gson工具类*/
public class GsonTool {/*** 使用gson需要先引入依赖**  <dependency>*             <groupId>com.google.code.gson</groupId>*             <artifactId>gson</artifactId>*             <version>2.9.0</version>*         </dependency>*/private static Gson gson = null;static {gson= new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();}/*** Object 转成 json** @param src  java obj* @return String*/public static String toJson(Object src) {return gson.toJson(src);}/*** json 转成 特定的cls的Object** @param json  String* @param classOfT    java class* @return  java obj*/public static <T> T fromJson(String json, Class<T> classOfT) {return gson.fromJson(json, classOfT);}/*** json 转成 特定的 rawClass<classOfT> 的Object** @param json String* @param classOfT  java class* @param argClassOfT  sub java class* @return java obj*/public static <T> T fromJson(String json, Class<T> classOfT, Class argClassOfT) {Type type = new ParameterizedType4ReturnT(classOfT, new Class[]{argClassOfT});return gson.fromJson(json, type);}public static class ParameterizedType4ReturnT implements ParameterizedType {private final Class raw;private final Type[] args;public ParameterizedType4ReturnT(Class raw, Type[] args) {this.raw = raw;this.args = args != null ? args : new Type[0];}@Overridepublic Type[] getActualTypeArguments() {return args;}@Overridepublic Type getRawType() {return raw;}@Overridepublic Type getOwnerType() {return null;}}/*** json 转成 特定的cls的list** @param json String* @param classOfT java class* @return java list obj*/public static <T> List<T> fromJsonList(String json, Class<T> classOfT) {return gson.fromJson(json,new TypeToken<List<T>>() {}.getType());}}